Sings in the Alps, say (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
yodels
(Other definitions for yodels that I've seen before include "Sings like Swiss mountain-dwellers (6)" , "Sings badly" , "Calls musically, Alpine-fashion" , "Sings falsetto" , "Sings in manner of Swiss mountain dwellers" .)